The Triumph Dolomite Club - Discussion Forum

Hi All

Looking for any Information on a Spare Cam I have , which I hope to use in a Sprint motor Im
Having rebuilt.
All Stampings along the shaft are the same as a standard Stanpart cam , and on the Sprocket
Flange it's Stamped ( CE 1 C 944 )

Thanks in advance

Steve

Steve

Look on the end of the camshaft nearest the windscreen & see what is stamped on there. Also, if you measure the lobe...



...and subtract A from B, this will give the total lift of the cam, which will be an indication of which cam it is.

Thanks Mart

Will have a look Monday , when I'm back at work.


Steve

Hi All

Stamping on the back end of the Cam is ( ZHW 5 )
A = 30.1 mm
B = 40.45 mm
Lift = 10.35 mm


The measurements are for the Cam on the Left
Any Info much appreciated

Cheers
Steve

According to the chart below then I would say it had a similar valve lift to the TT10106 (same as mine). Quite a long duration on that profile. Also I suspect it's a regrind rather than a billet cam, so you will need thick shims.

Hi Steve and Mart, I've updated the cams list with Piper and Newman cams:



Hope this helps

Thanks for that Ronald.

Thanks Guys

Mart you can see the weld buildup on the side of the Cams ,
So your right in saying its a regrind , the A measurement on the standard Cam
Is 30.5 mm .
Think I will use my works indexing head and a depth gauge to see if I can get
The opening and dwell angles.

Thanks for the Cam List Ronald

Steve

Actually I thought the base circle diameter you quoted was near to a standard cam but didn't check. Usually when cams are reground they aren't built up first but simply machined smaller. Like the STR91 I have in my hand, the base circle is approx. 27mm. dia..

Thanks for you're help Mart
What's you're opinion on the TT 10106 Cam for Road use . Or is that type of profile getting up
To Track use only .

Steve

I don't have any problems using it for normal road use.

I have some concerns about using a cam that has had the lobes built up with weld. Camshafts used to be case hardened, pack a camshaft in a box of carbon granules,seal and heat to about 900 degrees for 5 hours, the carbon is absorbed by the steel to a depth of about 0.040" after grinding the depth is about 0.030. Later camshafts were induction hardened, a much quicker process and just as effective although a different grade of steel forging is used.

so what happens to the hardness when it is built up with weld and can the lobe be re-hardened. Hopefully such camshafts have been proven in the field but if it was me, i would like to know more before fitting the cam to my engine.

I used to weld for a living, so can say with some confidence that you can weld with a case hard rod, Big digger bucket teeth was a favourite and many a smelly hour was spent at the local tip rebuilding teeth. This was all stick weld M.A.G. But I do share your concerns, as bits not "stuck" on correctly come adrift and wreck havoc, if it was soft it would just rub away, I suppose its down to the integrity of the cam supplier or even the welder who does this. A lot of my work was examined in the "non destructive test" for flaws etc. Wonder if the cam manufacturer had the technology to do this.